I wasn’t thinking of Brexit at all for once! Just the general issue of ways in which people are able to demonstrate that they have housing and finances to be allowed a titre de séjour. And if it can be done for non-eu people…
I rather think that for the man sponsoring his nephew… his nephew would probably need to show that he is/was a student or studying or some such… and a specific CdS (whatever) would be allocated according to his situation.
that is very different to the original question…
A retired person wanting to come from UK will need to go through all the hoops which relate to that his/her situation… 
Nope, he is a mid 30’s man, but presumably applied for whatever is appropriate to him with the help of his uncle.
Yes, having family already here would be a great help… I would think. 
OH did the same when he emigrated to Canada… courtesy of his Canadian Cousins… they had to undertake full responsibility for him… 
Way back in '81, before we got married, we declared a "vie concubinage " which at that stage, if I remember correctly, worked for two tax parts and health cover but my girlfriend didn’t get her CdS until we were married a year later.
I think that things were more flexible then, if you got sympathetic fonctionnaire. This codifying everything and putting it into law os considered progress but IMO it actually limits opportunities for a “good operator”, of which i would have considered myself one, in the day. it’s all rules now (often application based) with SFA room for a bit of discretion. 
Anyway, here’s what our money grabbing Notaire friends think on the matter…
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… then all Brits need to do is wait 10 months 
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